 Medical ultrasound, or sonography, is an imaging technology that uses high-frequency sound waves to see inside the body. A device called a transducer is used to produce and direct these sound waves to various regions of the body. Ultrasound's diagnostic uses are separated into two categories, anatomical and functional. Anatomical ultrasound is used to produce images of individual structures inside the body. Ultrasound builds on this. Measuring things like the movement and speed of blood or the softness or hardness of tissue, this helps doctors see changes in function within a body structure or organ. Ultrasound can also be used as a therapy to treat a variety of medical conditions. For example, physicians can apply special types of ultrasonic sound waves to modify or destroy tissue. They can also dissolve blood clots and help to deliver drugs noninvasively to specific locations in the body. Intensity ultrasound can even be used to target and destroy tumors without invasive surgery. Because of its diverse uses, safety, and relatively low cost, ultrasound is increasingly used in diagnostic and therapeutic medicine.